couple questions about rear suspension and drive shaft

[BIGBLU 72]

I am faced with the problem of a broken trailing arm and currently have it fixed with two pieces of 8 gauge angle iron and 4 massive stainless bolts haha. so i was wondering what kinda price im looking at to buy them new/used cause i would like to keep the truck coil over or is it gunna be cheaper/better for my truck to switch to rear leaves? what are some advantages/disadvantages of both. also what are some problems with the two piece drive shaft as i would like to switch to a one piece. my truck is a LWB btw